The Lower Deschutes in Maupin is a solid choice for trout fishing, with Euro Nymphs (Blue Perdigon is a favorite (thanks Amy!), but many other good choices and colors and bead sizes need to be considered).
Girdle Bugs and other stonefly nymphs, Micro Mayfly and 2 Bit Hookers to imitate Baetis nymphs, and definitely keep an eye open for Blue Wing Olive hatches with fish feeding at the surface this month on small duns and emergers.
Trout Spey swinging and nymphing is a super choice for this bigger water too.